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An ice cube floats in water, on top of which a layer of oil (less dense than water) has been poured. After the ice has melted completely, how do the water-oil interface level and the topmost oil surface change, respectively?
- rise and fall
- fall and rise
- rise and not change
- not change and fall
Correct answer: not change and fall
Solution
The water produced by melting exactly replaces the volume of water the submerged part displaced, so the water-oil interface stays put. The portion of ice that protruded into the oil no longer displaces oil, so the oil column drops, lowering the top oil surface.
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